Fear not, they know what it is....it is when Christ took bread into His hands and said "take and eat of this THIS IS MY BODY"....that is the Eucharist, taught by even Martin Luther and denied by protestants.....sad
being prior Catholic turned Protestant... Eucharist is not biblical, and Jesus was using metaphors, it is obvious the bread was not his body nor was he asking to be eaten - that would be cannibalism.... but you knew that already. There is no way the “bread” turns into flesh - or Water in to blood..
if you believe that, then you would have to believe that Jesus, sitting on the right hand of God would have to leave heaven, transform into a piece of bread, or cornstarch/flour wafer to be eaten by his creation... something doesn’t sound exactly right.